Barent Claesz (Claessen) of Zwolle (Dutch province of Overijssel), an Anabaptist martyr, a fuller by trade, was beheaded at Amsterdam on 6 March 1535, with eight others, charged with membership in the Anabaptist brotherhood.

Braght, Thieleman J. van. The Bloody Theatre or Martyrs' Mirror of the Defenseless Christians Who Baptized Only upon Confession of Faith and Who Suffered and Died for the Testimony of Jesus Their Saviour . . . to the Year A.D. 1660. Scottdale, PA: Herald Press, 1951: 763. Available online at: http://www.homecomers.org/mirror/index.htm.